Functionalized inorganic fluorides : synthesis, by Alain Tressaud

By Alain Tressaud

Functionalized Inorganic Fluorides: Synthesis, Characterization ' houses of Nanostructured Solids covers a number of periods of nanostructured and functionalized inorganic fluorides, oxide-fluorides, and fluorinated oxides resembling silica and alumina. starting from powders or glass-ceramics to skinny layers and coatings, they've got purposes as extra effective and no more competitive catalysts, UV absorbers, planar optical waveguides, built-in lasers and optical amplifiers, luminescent fabrics, anti-reflective coatings and excessive Tc superconductors.With a spotlight on new different types of solids, similar to nanopowders, hybrids, mesoporous fluorides, and intercalation compounds, the ebook covers new synthesis routes; physical-chemical characterizations - together with morphology, constitution, spectroscopic and optical behaviour; distinct ab initio investigations and simulations; and -last yet no longer least- strength purposes

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Extra resources for Functionalized inorganic fluorides : synthesis, characterization & properties of nanostructured solids

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1 GPa at room temperature. Nano-sized metal fluorides have a promising perspective as inorganic component of organic polymers. Due to their small size the particles are invisible even in transparent polymers but may, in possibly decisive ways, change physical properties such as dielectric constant, index of refraction or mechanical properties. However, preventing agglomeration of these nano particles is a challenging task, but one that is not easy to accomplish and that needs to be further developed.

The sol-gel state, almost immediately formed, kinetically prevents the stoichiometric fluorination of the aluminium species. Upon removing the alcohol under gentle conditions the gel structure only partly collapses; alcohol molecules of the first ligand sphere remain obviously attached to Al. When these molecules are removed under appropriate mild conditions there is no crystallization taking place but the disordered X-ray amorphous state connected with an unusual high surface area remains and a part of the Al atoms becomes co-ordinately unsaturated consequently exhibiting very high Lewis acidity (see below).

The results and consequences of these investigations are presented and discussed below as well as in subsequent chapters. 3. 3 Fluorolytic sol-gel synthesis of high surface area metal fluorides (for explanations of the numbers 1 to 5 see text) The synthesis was investigated in detail, aiming its optimization for HS-AlF3 [8] and also for HS-MgF2 [10, 11]. 3), so that in the case of aluminium isopropoxide the tetrameric structure is predominantly preserved. , ether or alcohol is added in approximately stoichiometric amounts to the alkoxide solution.

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